Help :(

Hi, I'm 20 years old, my partner is 30, we're due to get married at the end of this year but we're going down hill.... All we seem to do is argue, not just little arguments big arguments that last ages. He's changed a lot, I have no family or friends at all, my family have nothing to do with me and haven't since the age of 3, got back into contact when I was 13 but disowned me again, I have no friends as I'm not very good at communicating and feel like everyone takes advantage and laughs at me.... so I literally just have him. I live in his house and we've been together for 2 years. We're not happy together at all, everything I do is wrong for him, he takes me for dinner sometimes and we're happy but then the slightest thing and he's pissed off and goes off on one, I can't handle him, he seems to be using his hands on me a lot more now too, I understand I can be a bitch but I don't hurt or touch him, id dye for him. I can't just leave I'd be heartbroken but I think I'm staying around for the wrong reasons. He seems to care what everyone else thinks rather than what I think, he plays the game as in everything is my fault, he takes no responsibility, gets Moody if I want to go out to the shops by myself. I feel trapped and I don't know if it's me or this is just a really bad relationship. I can't just get up and go as I have nowhere to go I'd be homeless, he makes me feel horrible but I love him, it's so hard :(